Find values of x and y such that both fx(x,y) = 0 and fy(x,y) = 0.f(x,y) = x + y + 8xy + 3
A. x = - 
, y = - 
B. x = - 
, y = - 
C. x = - 
, y = - 
D. x = - 
, y = - 
Answer: A
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